Status of the Water Tank Carla Cattadori INFN Milano & LNGS

Transcription

1 Status of the Water Tank Carla Cattadori INFN Milano & LNGS 15 March, 2006 C.Cattadori \GERDA meeting\ 1

2 Technical Specifications Operational Specifications Position Elevation Position Elevation Inner diameter 9980 mm Design pressure/depressure Design temperature mbar C Shell height 8400 mm Operating pressure 30 mbar Operating temperature ~ 12 0 C Total height 8900 mm Water height 8500 mm H2O Roof Conical + cupole Water recirculation Emptying procedure 30 m 3 /h Gravity + N pressurization. Draining hole DN 300 Bottom Flat Load on the roof Statical verification 350 kg/m 2 API Std 650 Total weight kg Seismic verification Wind verification Yes- Eurocode 8 No 15 March, 2006 C.Cattadori \GERDA meeting\ 2

3 Roof and Shell Roof Shell Specifications (2) conical 6 0. Innner part cupole with central hole DN 1200 to allow insertion of cryostat. Centering ring and sealing device included (if standard). Sheet metal plates coupling at ground level then lift with crane etc. In The mantle as reported in the a project drawing (ref) an hole will be left in order to allow the insertion of the cryostat etc. After that the aperture will be closed. Bottom Plate weldings). flattened. Dimensioned following API prescriptions (superimposed In the central part (R ~ 2500 mm) it will be dimensioned to keep both the idrostatic load and the cryostat load ( 70 t TB verified). In this region the metal plates will be head soldered and welding (Inclinazione for emptying?). Insulation layer included (TBD) 15 March, 2006 C.Cattadori \GERDA meeting\ 3

4 Accessories N.1 manhole in the mantle N.1 manhole in the roof (DN 500) N.2 Safety valves (pressure/depressure) DN 200 to prevent tank integrity during operation (mainly emtying) (in the roof). N. 2 Level sensor N.1 connection for N inlet N. 2 flanges DN300 to empty the tank N.2 (top and bottom) Connection net fit DN 80 for water recirculation N.1 DN 1200 flange in the roof with sealing for cryostat neck. N. 4-6 DN250 flanges (for PM chimneys).. 15 March, 2006 C.Cattadori \GERDA meeting\ 4

5 Mounting procedure Explicitely mentioned in many point of tendering document the insertion of cryostat after mantle WT assembly. We have now the chance to modify the procedure but is the last one. If yes we have to do it now! And then fix it. Most important: when and for how long the WT construction has to be stopped Cleaning (TB agreed): manually Verifications.. (as in Borexino) Mounting of PM fixing structures (when)? 15 March, 2006 C.Cattadori \GERDA meeting\ 5

6 25/11/2005 Timing of WT and Structure Month Tank Tendering Tank Tank Tank Tank Engineering Material Shipping Work Shop Fab. Site Fab. After bottom plate put in place Structure Tendering Workshop Structure Fab. and Shipm. Structure Construction (on site) Crystat Cryost. Insertion Structure Construction (on site) Tank Construction (on site) Test and Tank Approval 15 March, 2006 C.Cattadori \GERDA meeting\ 6

7 Water Tank Time schedule Extimated schedule for the WT tender and Wt construction Guessed schedule Actual schedule Not included unexpected events, from the commisioner side,from GERDA side,relevant modification to the exist WT Time schedule Tender Pubblished on Gazzetta Ufficiale January 2006 Prequalifying phase (minimum 19 days from pubblishing) 23-gen Mailing of invitation letters 23 gen- 31 gen INFN mails the invitation letters to the interested companies. First meeting of the tender commission (C. Cattadori, P.Martella, G.Pepato) verifica documentazione di prequalifica e spedizione delle lettere di invito alle imprese qualificate (max 120 gg dalla data di pubblicazione del bando su gazzetta ufficiale) no imprevisti su documenti 7 february Interested companies visit LNGS to receive a copy of the def 1 feb - 23 feb Deadline for companies to send offers 24-feb 15 March Preliminar declaration of the winning company. 27 feb - 03 mar 20 March Second meeting of the commettee verifica offerte e verbali no imprevisti su documenti Tender documentation is sent to INFN central administration 6 mar-10 mar The INFN central admin. verify that the tender has been performed properly and that the company is formally in th Definitive declaration of the winning company (??????????? 15-mag May WT WORKS Executive project (45 dd) 15 mag - 30 giu Material purchase 15 giu - 30 lug Work at the company site 30 giu - 30 set Mounting at LNGS 15 set - 15 nov Cryostat and third skin insertion (???? just exercise) 15 nov - 15 dic montaggio presso laboratori 1 gen - 30 gen 2007 collaudi 30 gen - 28 feb days 285 gg compresi 15 gg di fermo a natale e 15 ad agosto 15 March, 2006 C.Cattadori \GERDA meeting\ 7

8 Proposed chimneys for μ-veto cables 15 March, 2006 C.Cattadori \GERDA meeting\ 8

9 Proposed chimneys for manhole access 15 March, 2006 C.Cattadori \GERDA meeting\ 9

10 Conclusions WT tendering procedure is going on as foreseen. T0 (of schedule presented in june 2005 in Dubna) = 25 November 2005 WT interface to LNGS and site are under controll (anchorage, water drain, water inlet etc). Water Recirculation plant : to be dimensioned (M. Balata, E. Castagna) We need to define in a realist and reasonable way the WT and cryostat schedules. If we keep the showed schedule the WT is in advance compared to the foreseen (50% CL probability) cryostat delivery date (november 2006)? What about the other 50%? Possible to slow down the WT tender path. But there are limitation on how many months we can keep the working site suspended. 15 March, 2006 C.Cattadori \GERDA meeting\ 10

11 GERDA Location in Hall A Service space for assembly. Interference with CUORE assembly possible in case of severe delay of GERDA 15 March, 2006 C.Cattadori \GERDA meeting\ 11

12 Tank and service structures 15 March, 2006 C.Cattadori \GERDA meeting\ 12

13 Tank and service structures 15 March, 2006 C.Cattadori \GERDA meeting\ 13

14 The provisional opening WT construction plan foresees to leave a part open (the shape may be that shown or simply rectangular) for insertion of the Cryostat. The construction of the tank will then be completed by final soldering. Work programme will need to know the timing of the cryostat 15 March, 2006 C.Cattadori \GERDA meeting\ 14

15 Provisional opening (Section) questa l ho messa in più. Non credo serva 15 March, 2006 C.Cattadori \GERDA meeting\ 15

16 Footprint on the floor The interference with the Commissary civil works shown in the drawing have been solved changing the civil works design The positions of the fixing pins in the floor both of the WT and of the cryostat has been be frozen and will be realized in next 2 monthes by Commisioner companies. 15 March, 2006 C.Cattadori \GERDA meeting\ 16

17 Anchorage pins For the Cryostat For the Water Tank 15 March, 2006 C.Cattadori \GERDA meeting\ 17

18 The Roof In this version weak soldering are foreseen in the central sectors. Should break in case of LN spill in water and consequent explosion The Laboratory request of triple containment of LN may request a change of this detail Presumably N2 in gas phase escaping from the WT or from the cryostat will be guided to a specially built heat exchanger and then to the exhaust duct foreseen in the Commissary works 15 March, 2006 C.Cattadori \GERDA meeting\ 18

19 Plant of the 3rd floor LNGS will fund and realise the construction of the service building. This will not include the clean-room construction rubber layer steel plate 15 March, 2006 C.Cattadori \GERDA meeting\ 19

20 Plant of the 3rd floor 15 March, 2006 C.Cattadori \GERDA meeting\ 20

21 WT&Structure Construction Programme End construction of the structure End construction of the tank Construction of the structure Insertion of Cryostat Construction of the WT leaving the opening for cryostat 15 March, 2006 C.Cattadori \GERDA meeting\ 21